I've actually seen all of those maps at anglo-saxons.net...they are amazing, and all hand drawn. I somewhat used them as reference, actually.
That map of the old roman roads is a good one though. I hadn't seen that one...I might just add some roads to the map.
We are both going to handle the Norman invasion and a struggle for the throne. I think Canute is the king of England at the start though. There are going to be two of us running the game together...and he is responsible for a lot of the more 'mundane' things. (in Ars Magica terms, that means actual historical events and what not outside of the scope of magi, who are not supposed to meddle in things like that).
As a group, Ars Magica is probably the game we play more than any other. We were playtesters on the current version and have run like 3 or 4 campaigns since then.
Here is the map I made for the campaign we are just now finishing up.